/*
 * contrib/btree_gist/btree_time.c
 */
#include "postgres.h"

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/timestamp.h"

typedef struct
{
    TimeADT        lower;
    TimeADT        upper;
} timeKEY;

/*
** time ops
*/
PG_FUNCTION_INFO_V1(gbt_time_compress);
PG_FUNCTION_INFO_V1(gbt_timetz_compress);
PG_FUNCTION_INFO_V1(gbt_time_fetch);
PG_FUNCTION_INFO_V1(gbt_time_union);
PG_FUNCTION_INFO_V1(gbt_time_picksplit);
PG_FUNCTION_INFO_V1(gbt_time_consistent);
PG_FUNCTION_INFO_V1(gbt_time_distance);
PG_FUNCTION_INFO_V1(gbt_timetz_consistent);
PG_FUNCTION_INFO_V1(gbt_time_penalty);
PG_FUNCTION_INFO_V1(gbt_time_same);


#ifdef USE_FLOAT8_BYVAL
#define TimeADTGetDatumFast(X) TimeADTGetDatum(X)
#else
#define TimeADTGetDatumFast(X) PointerGetDatum(&(X))
#endif


static bool
gbt_timegt(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;

    return DatumGetBool(DirectFunctionCall2(time_gt,
                                            TimeADTGetDatumFast(*aa),
                                            TimeADTGetDatumFast(*bb)));
}

static bool
gbt_timege(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;

    return DatumGetBool(DirectFunctionCall2(time_ge,
                                            TimeADTGetDatumFast(*aa),
                                            TimeADTGetDatumFast(*bb)));
}

static bool
gbt_timeeq(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;

    return DatumGetBool(DirectFunctionCall2(time_eq,
                                            TimeADTGetDatumFast(*aa),
                                            TimeADTGetDatumFast(*bb)));
}

static bool
gbt_timele(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;

    return DatumGetBool(DirectFunctionCall2(time_le,
                                            TimeADTGetDatumFast(*aa),
                                            TimeADTGetDatumFast(*bb)));
}

static bool
gbt_timelt(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;

    return DatumGetBool(DirectFunctionCall2(time_lt,
                                            TimeADTGetDatumFast(*aa),
                                            TimeADTGetDatumFast(*bb)));
}



static int
gbt_timekey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    timeKEY    *ia = (timeKEY *) (((const Nsrt *) a)->t);
    timeKEY    *ib = (timeKEY *) (((const Nsrt *) b)->t);
    int            res;

    res = DatumGetInt32(DirectFunctionCall2(time_cmp, TimeADTGetDatumFast(ia->lower), TimeADTGetDatumFast(ib->lower)));
    if (res == 0)
        return DatumGetInt32(DirectFunctionCall2(time_cmp, TimeADTGetDatumFast(ia->upper), TimeADTGetDatumFast(ib->upper)));

    return res;
}

static float8
gbt_time_dist(const void *a, const void *b, FmgrInfo *flinfo)
{
    const TimeADT *aa = (const TimeADT *) a;
    const TimeADT *bb = (const TimeADT *) b;
    Interval   *i;

    i = DatumGetIntervalP(DirectFunctionCall2(time_mi_time,
                                              TimeADTGetDatumFast(*aa),
                                              TimeADTGetDatumFast(*bb)));
    return (float8) Abs(INTERVAL_TO_SEC(i));
}


static const gbtree_ninfo tinfo =
{
    gbt_t_time,
    sizeof(TimeADT),
    16,                            /* sizeof(gbtreekey16) */
    gbt_timegt,
    gbt_timege,
    gbt_timeeq,
    gbt_timele,
    gbt_timelt,
    gbt_timekey_cmp,
    gbt_time_dist
};


PG_FUNCTION_INFO_V1(time_dist);
Datum
time_dist(PG_FUNCTION_ARGS)
{
    Datum        diff = DirectFunctionCall2(time_mi_time,
                                           PG_GETARG_DATUM(0),
                                           PG_GETARG_DATUM(1));

    PG_RETURN_INTERVAL_P(abs_interval(DatumGetIntervalP(diff)));
}


/**************************************************
 * time ops
 **************************************************/



Datum
gbt_time_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}


Datum
gbt_timetz_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    GISTENTRY  *retval;

    if (entry->leafkey)
    {
        timeKEY    *r = (timeKEY *) palloc(sizeof(timeKEY));
        TimeTzADT  *tz = DatumGetTimeTzADTP(entry->key);
        TimeADT        tmp;

        retval = palloc(sizeof(GISTENTRY));

        /* We are using the time + zone only to compress */
        tmp = tz->time + (tz->zone * INT64CONST(1000000));
        r->lower = r->upper = tmp;
        gistentryinit(*retval, PointerGetDatum(r),
                      entry->rel, entry->page,
                      entry->offset, FALSE);
    }
    else
        retval = entry;
    PG_RETURN_POINTER(retval);
}

Datum
gbt_time_fetch(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}

Datum
gbt_time_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    TimeADT        query = PG_GETARG_TIMEADT(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

    /* Oid        subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    timeKEY    *kkk = (timeKEY *) DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

    /* All cases served by this function are exact */
    *recheck = false;

    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;

    PG_RETURN_BOOL(
                   gbt_num_consistent(&key, (void *) &query, &strategy, GIST_LEAF(entry), &tinfo, fcinfo->flinfo)
        );
}

Datum
gbt_time_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    TimeADT        query = PG_GETARG_TIMEADT(1);

    /* Oid        subtype = PG_GETARG_OID(3); */
    timeKEY    *kkk = (timeKEY *) DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;

    PG_RETURN_FLOAT8(
                     gbt_num_distance(&key, (void *) &query, GIST_LEAF(entry), &tinfo, fcinfo->flinfo)
        );
}

Datum
gbt_timetz_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    TimeTzADT  *query = PG_GETARG_TIMETZADT_P(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

    /* Oid        subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    timeKEY    *kkk = (timeKEY *) DatumGetPointer(entry->key);
    TimeADT        qqq;
    GBT_NUMKEY_R key;

    /* All cases served by this function are inexact */
    *recheck = true;

    qqq = query->time + (query->zone * INT64CONST(1000000));

    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;

    PG_RETURN_BOOL(
                   gbt_num_consistent(&key, (void *) &qqq, &strategy, GIST_LEAF(entry), &tinfo, fcinfo->flinfo)
        );
}


Datum
gbt_time_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(timeKEY));

    *(int *) PG_GETARG_POINTER(1) = sizeof(timeKEY);
    PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
}


Datum
gbt_time_penalty(PG_FUNCTION_ARGS)
{
    timeKEY    *origentry = (timeKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    timeKEY    *newentry = (timeKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
    float       *result = (float *) PG_GETARG_POINTER(2);
    Interval   *intr;
    double        res;
    double        res2;

    intr = DatumGetIntervalP(DirectFunctionCall2(
                                                 time_mi_time,
                                                 TimeADTGetDatumFast(newentry->upper),
                                                 TimeADTGetDatumFast(origentry->upper)));
    res = INTERVAL_TO_SEC(intr);
    res = Max(res, 0);

    intr = DatumGetIntervalP(DirectFunctionCall2(
                                                 time_mi_time,
                                                 TimeADTGetDatumFast(origentry->lower),
                                                 TimeADTGetDatumFast(newentry->lower)));
    res2 = INTERVAL_TO_SEC(intr);
    res2 = Max(res2, 0);

    res += res2;

    *result = 0.0;

    if (res > 0)
    {
        intr = DatumGetIntervalP(DirectFunctionCall2(
                                                     time_mi_time,
                                                     TimeADTGetDatumFast(origentry->upper),
                                                     TimeADTGetDatumFast(origentry->lower)));
        *result += FLT_MIN;
        *result += (float) (res / (res + INTERVAL_TO_SEC(intr)));
        *result *= (FLT_MAX / (((GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1));
    }

    PG_RETURN_POINTER(result);
}


Datum
gbt_time_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(gbt_num_picksplit(
                                        (GistEntryVector *) PG_GETARG_POINTER(0),
                                        (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                        &tinfo, fcinfo->flinfo
                                        ));
}

Datum
gbt_time_same(PG_FUNCTION_ARGS)
{
    timeKEY    *b1 = (timeKEY *) PG_GETARG_POINTER(0);
    timeKEY    *b2 = (timeKEY *) PG_GETARG_POINTER(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);

    *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
    PG_RETURN_POINTER(result);
}
